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What is a lie detector test?2018-05-24T16:59:22+00:00

What is a Lie Detector Test?

A lie detector test is also known or commonly referred to as a polygraph test or polygraph examination. It is one of the most powerful, robust and useful scientific tools in truth verification or the detection of deception regarding a specific issue, incident or event.

The term “polygraph” derives from the Greek words poly (many) and graph (writing) “many writings”.

A polygraph examination involves an in-depth procedure, using state of the art, computerised equipment and validated test techniques. During an examination, manifestations of a person’s nervous system are recorded from at least three systems in the body.

Two convoluted tubes are placed around the upper chest and abdomen of a person to record respiratory activity. Two metal plates or disposable adhesive electrodes are attached to a person’s fingers to record sweat gland activity and a blood pressure cuff will record cardiovascular activity. A motion sensor will monitor general movements throughout the examination.  A finger plethysmograph may also be used to monitor blood volume.

Voice stress tests should not be confused with a Polygraph Test. The two are completely different tests with voice stress testing working no better that pure chance (i.e. the accuracy of such voice stress instruments are similar to making a decision based on a flip of a coin). We therefore do not use it in our examinations.

An examination should only be conducted by an experienced and trained polygraph examiner.

Further FAQ’s

Although no forensic testing of any kind can be guaranteed to be 100% accurate, research gathered by The American Polygraph Association has suggested that qualified polygraph examiners can achieve an accuracy of 95% to 98% when an examination is conducted in an accurate manner, with issue-specific questions and using validated polygraph techniques.

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The lie detector test records manifestations of a person’s nervous system from at least three systems in the body whilst questioned about concerns of a specific issue, incident or event. The examiner will analyse the charts collected and render an opinion as to the persons truthfulness.

A polygraph examination consists of four phases and will typically take between 2 to 3 hours to complete.

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In short, lie detector test prices vary throughout the UK ranging from £395 to £695 for a specific issue test with an average test costing of around £550.

Lie Detector Test Costs can vary depending on several factors from location, examiner experience, third-party providers, and the number of tests required. Therefore, it is imperative you check the credentials of the polygraph examiner and company before committing and ensure you are asking the correct questions.

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There are several factors to consider before you choose a Polygraph Examiner. These include primary training, overall experience, continuing education and the use of the latest computerised equipment & validated test techniques. In each section below, we have provided a brief outline as to what checks and credentials should be undertaken or verified.

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